Boiler



Jan. 8, 1929.

D. W. ROBB BOILER Filed July 26, 1927 2 Sheets-Sheet 1 INVENTOR. 3717207970, 8

A TTORNEYJ D. W. ROBB Jan. 8, 1929.

BOILER Filed July 25, 1927 2 Sheets-Sheet 2 Y INVENTOR. fl B07979,

A); ATTORNEY.3

tively few heat units.

Patented Jan. 8, 1929.

YES

DAVID WENTWORTH ROBE, F AMHERST, NOVA SCOTIA, CANADA.

BOILER.

. Application filed July 26,

This invention relates to improvements in boilers or furnaces and the like.

One object of the invention isto provide a boiler wherein the heat units of the products of combustion may be utilized with a higher degree of eificiency when the fire has been properly stimulated while, at the same time, when combustion is comparatively low, the path of the circulating products of combustion may be readily variedso as to stimulate combustion at the expense or loss of compara A further object of the invention is to provide, in a boiler of this type, a novel form of draft regulating mechanism. 7

With these and otherobjects in view the invention consists in certain novel details of construction, and'combinations and arrangements of parts, all as will hereinafter be more fully described and the novel features thereof particularly pointed out in the appended claims.

In the accompanying drawings,

Figure 1 is a longitudinal section through a boiler embodying the present improvements.

Fig. 2 is a sectional view on the line 2 2 of Fig. 1; and

Fig. 3 is a sectional view taken horizontally through the upper portion of the boiler.

While the invention, in various aspects, is not limited to any particular construction of boiler, the boiler shown in the present instance comprises outer and inner shells 10,

11, forming water spaces 12, a fire door 13 l being provided at the front. If desired, door 13 may be provided with a carburetor 14 of the type shown in applicants Patents No. 1,513,425 dated October 28, 1924, and No.

- 1,565,674, dated December 15, 1925. At its lower portion the front of the boiler is pro-. vided with a door 15 through which access -may be had to ash pit 16 below the grate sec-.

tions 17. The front grate section indicated at 17 is capable of being dumped by an op erating lever 18 at one side of the boiler while the remaining grate section 17 may be rocked for shaking down the fire by an operating lever 19 at the front of the boiler.

At the top of the combustion chamber there is a water space 20 formed by the COP'SQClZlOIlS 10 11 of the outer and inner shells and depending from the inner shell ll is a plurahty' of water tubes 21 which communicate with said water space 20. Preferably, these water 1927. Serial no. 208,505.

tive circulation of the water in said tubes is induced. By having the tubes inclined some what to the vertical the heated water circula tes upwardly in atruly vertical direction laying close to the upper sides of the inclined tubes while the colder water will circulate downwardly along the lower sides of said tubes. I later is supplied to the boiler through the inlet pipes 22 which communicate with the water spaces 12 at the base of the boiler while the heated water is discharged through the outlet 23 in the top section 10 of the outer shell.

In order to give the depending tubes 21, as well as the other heating surfaces in the upper portion of the boiler, the full benefit of the heat units carried by the products of combustion the smoke pipe .24 communicates with the combustion chamber 25 at the rear thereof at which point there is a water baffle 26 eX- chamber 25 to the smoke pipe 24. At its sides said bafiie 26 is formed with a water space 28 which communicateswith the water space 20 in the upper portion of the boiler. If all sides of the baffle 26 were made solid it will be apparent that the products of combustion in the combustion chamber, and especially those in the forward portion thereof, would rise in said chamber and'circulate in a rather tortuous path amongst'the water tubes until they came into contact with said baflle whereupon they would be deflected downwardly before entering the internal passage 27 of said baflie from whence they escape to the smoke pipe 24. Such a tortuous circulation of the products of combustion is highly desirable in order to utilize the greatest number of heat units therein but when the fire in the boiler is comparatively low, combustion cannot be very quickly stimulated so long as the products of combustion are compelled to take this tortuous path in reaching the smoke pipe. Consequently, in the present invention, means are provided for permitting theproducts of combustion to escape from the upper portion of the combustion chamber 25 directly tosmoke. pipe 24. This is preferably accompl ished by having the front wall of the bafiie 26- provided with a duct 29 through "which the products of combustion may reach the smoke pipe without passing through the in tcrnal passage 27 of said baffle. Ordinarily,-

When the fire in the boiler is low and it is desired to increase combustion the products 7 of combustion are allowed to flow through the smoke pipe 24 to duct 29 butafter the'fire has been stimulated to the desired extent duct 29 is'adapted to be closed by a valve 30 whereupon the products of combusti0n must then :p'ass downwardly along the exterior wall of the battle and flow upwardly through the internalpassages 27 of said balii'e- In this Way,

"comparatively all of the heat'units are util ized'as before mentioned,

To regulate thedraftthrough the boiler the smoke'pipe is provided with a rocking shut-cit" damper 31 adapted to be rocked on its center by an operating lever 33 connected to the sl aft of said damper by a link 32. The smoke pipe 24: is also provided With a check damper 34 Whoseinner face has projection '35 formed thereon andeXte-nding from the shaft of said shut-off damper 31 is an arm 36 :ad'aptedto engagerprojection 35 on the check 'damp'er34 when the shutoff damper 31 ismoved to its closedposition. As indicated in dotted lines in Fig; 1 this cooperation between arm 36 and projection 3F is such that when 'the shut-ofl dam-per is completely closed the 7 check dam-per will be fully opened. in accordance with the present invention, it is alsopr'eferred that valve 30 ofduct 29 ot baiiie -26 be also actuated by theoperating member '33. 'Forthis reason the'shai t of the shut-off damper-31'is provided with a second arm 37 'connect'ed'by a link 38 to said valve 30. As shown in the drawings, link 38 has apin and slot connection "with arm-37 so thatvalVe-3O may be adjusted toward and from'said arm tocoordinate the'movements of valve 30'and the shut-0H damper as desired. Preferably, this connection is such that when the shut-oft" damper is in thevertical or fully opened position, the valve 30=is also fully opened, thereby giving a direct draft from the :fi-re through the duct 29 in the Water battle. To move these parts to the positions named operating mem-. her 33 is moved inwardly'toward the smoke pipe suchmovement of the parts'permitting the-damper 34 to lall'by gravity to its closed I "and the valve 30 0f duct 29 towardtheir closed positions. The arrangement of theconn'ec-tions between the shut-oil damperand valve-'ispreferably such that when the shutoff damper'i's actually closed, thevalve 30 will lee-fully closed forcing thehot gases to pass around thobottom edge of the Water baffle to gases. The regulation of the movement of the check damper 34, sh ut-o'fi damper 31, and valve 30, may however, be'varied with respect to each other by adjusting the connect'ion between the arm 3'? and link 38 orby varying the positions of arms 33,37, around the center of rotation of the shut-oft dan per 31. To r'etainoperating member 33 many desired position it maybe provided with a series of notches 39 adapted to cooperate with asuitable'locking member or plate 40 at the "front of the boiler. i

What I claim'is:

1. In a boiler or the like, thecombin'ation of a smoke pipeiorthe combustion chamber, a bathe in said chamber having an internal passage throughout its length communicating With-said smoke pipe, whereby-products of combustion. may traverse 't'h'e tull length of said battle, a damper controlling thetlow of air through'said passage, an auxiliary passage from said combustion chamber to said 1 i e and means controllin the flow of air 7 D through said auxiliaryp'assage.

I 2. In a boiler or the like, the'combi nation of a smoke pip'eforthe combustion chamber, an elongated b'a'lile lravinga longitudinally extending passage therein through which. products ot combustion may flow trom the combi-istion chambertosaid pipe, a cut-off duct inone Wall of said battle through which products of combustion may flow directly fromthe combustion chamber to the smoke pipe, andmeans forrcguliating the flow of said products of combustion through the passage and-the duct of'sai'd baths.

3. ln a boiler orthe like, the combination ofasmokepipe for the combustionchamber,

I elongated bafile having a longitudinally extending passage therein through which products of combustion m ay 'fiow fromthe combustion clramber'to said pipe,'a cut-off dust in one wall 'o'f'said battle through which products of combustion may flow directly from the combustion chamber to the smoke pipe, meansi or closing said ductyand a shutotl damper for preventing theflow of prodnets of combustionthrou-gh said smoke pipe.

v 4. "In a boiler or the like, the combination of-a smoke pipe for the combustion chamber, an elongated baffle having a' longitudinally extending passage therein through which proclucts of combustion vmay flow irom the coinbu'stion chamber'to said pipe, a cut-off duct' in one wall of said baffle through which products of combustion may flow directly from the combustion chamber to the smoke pipe, a

shut-ofi' damper for preventing flow of prod-- ucts of combustion through the smoke pipe, a valve for sald duct, and connections between said valve and damper for closing said valve as said damper is closed, and for opening said products oi combustion may flow directly vfrom the combustion chamber to the smoke pipe, a shut-off damper for preventing flow of products of combustion through the smoke pipe, a valve for closing said duet, an operating member for opening and closing said damper, said valve being movable to opened or closed positions simultaneously with said damper.

6. In a boiler or the like, the combination of a smoke pipe for the combustion chamber, an elongated baflie having a longitudinally extending passage therein through which products of combustion may flow from the combustion chamber to said pipe, a cut-off duct in one wall of said baffle through which products of combustion may flow directly from the combustion chamber to the smoke pipe, a shut-oft damper for preventing flow of products of combustion through the smoke pipe, a check-damper in said pipe, a valve for said duct in the bafiie wall, and means for simultaneously opening or closing said valve and shut-off damper, said check damper being simultaneously movable to open position when said'shutofi' damper is closed and to closed position when said shut-off damper is open.

7. In a boiler or the like, the combination of a smoke pipe for the combustion chamber an elongated bafile having a longitudinally extending passage therein through which products of combustion may flow from the combustion chamber to said pipe,'a cut-ofl' duct in one Wall of said baffle through which products of combustion may flow directly from the combustion chamber to the smoke pipe, at shut-oft damper for preventing How of products of combustion tliroughthe smoke pipe, a check-dan'lper in said pipe, a valve for said duct in the baffle wall, and an operating member for simultaneously opening said check-damper and closing said shut-off damper and valve and for simultaneously opening said shut-0E damperand valve, said check-damper being movable by gravity to its closed position when said shut-off damper and valve are opened by said operating memher.

8. In a boiler, the combination of a smoke pipe for the combustion chamber, a series of depending water tubes in said chamber, a depending water baifie in said chamber having an internal passage extending'throughout its length and communicating with saidsmoke pipe, and means forpermitting products of combustion to flow directly from said combustion chamber tosaid smoke stack independently of the internal passage through said water baifle.

DAVID WENTYVORTH ROBB, 

